Zonda,
Although someone will bite, I don't see this gig as all that attractive to US citizens: get EASA license within two years...training bond ? No thanks... It'll be fun to see how it turns out though.
You mentioned this: "Potentially blackballed by ALPA legacy carriers". I've seen that statement made by others in relation to this job.
But, how would such a reaction be implemented and by whom within the legacy carrier framework ? I can see how ALPA could by perhaps denying membership but do legacy carrier managements really care about what can't be more than a handful of pilots who might've flown for NAI for a few years ?